linux-kernel - [RFC PATCH 08/10] clocksource: time-pistachio: Register the persistent clock

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Message-Id: <e923209285df7043bd52c136ba85507891b4b059.1526285602.git.baolin.wang@linaro.org>
Date:   Mon, 14 May 2018 16:55:34 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     tglx@...utronix.de, john.stultz@...aro.org,
        daniel.lezcano@...aro.org, arnd@...db.de, tony@...mide.com,
        aaro.koskinen@....fi, linux@...linux.org.uk, mark.rutland@....com,
        marc.zyngier@....com
Cc:     baolin.wang@...aro.org, broonie@...nel.org,
        paulmck@...ux.vnet.ibm.com, mlichvar@...hat.com,
        rdunlap@...radead.org, kstewart@...uxfoundation.org,
        gregkh@...uxfoundation.org, pombredanne@...b.com,
        thierry.reding@...il.com, jonathanh@...dia.com, heiko@...ech.de,
        linus.walleij@...aro.org, viresh.kumar@...aro.org,
        mingo@...nel.org, hpa@...or.com, peterz@...radead.org,
        douly.fnst@...fujitsu.com, len.brown@...el.com,
        rajvi.jingar@...el.com, alexandre.belloni@...tlin.com,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [RFC PATCH 08/10] clocksource: time-pistachio: Register the persistent clock

Since the timer on pistachio platform is always available, we can
register it as one persistent clock to compensate the suspend time
for the OS time.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 drivers/clocksource/Kconfig          |    1 +
 drivers/clocksource/time-pistachio.c |    3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index ed19757..b45be75 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -255,6 +255,7 @@ config CLKSRC_PISTACHIO
 	bool "Clocksource for Pistachio SoC" if COMPILE_TEST
 	depends on HAS_IOMEM
 	select TIMER_OF
+	select PERSISTENT_CLOCK
 	help
 	  Enables the clocksource for the Pistachio SoC.
 
diff --git a/drivers/clocksource/time-pistachio.c b/drivers/clocksource/time-pistachio.c
index a2dd85d..5c3eb71 100644
--- a/drivers/clocksource/time-pistachio.c
+++ b/drivers/clocksource/time-pistachio.c
@@ -20,6 +20,7 @@
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/persistent_clock.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/sched_clock.h>
@@ -212,6 +213,8 @@ static int __init pistachio_clksrc_of_init(struct device_node *node)
 
 	raw_spin_lock_init(&pcs_gpt.lock);
 	sched_clock_register(pistachio_read_sched_clock, 32, rate);
+	persistent_clock_init_and_register(pistachio_read_sched_clock,
+					   CLOCKSOURCE_MASK(32), rate, 0);
 	return clocksource_register_hz(&pcs_gpt.cs, rate);
 }
 TIMER_OF_DECLARE(pistachio_gptimer, "img,pistachio-gptimer",
-- 
1.7.9.5